books.google.nl - "Understanding and using problem frames will likely become an essential skill of all good software system designers. Jackson's book provides a beautifully crafted pathway into this world." David Garlan, Associate Professor, Computer Science Department, Carnegie Mellon University "In 'Problem Frames'...https://books.google.nl/books/about/Problem_Frames.html?hl=nl&id=8fqIP83Q2IAC&utm_source=gb-gplus-shareProblem Frames